/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.dolphinscheduler.plugin.task.pytorch;

import org.apache.dolphinscheduler.common.utils.JSONUtils;
import org.apache.dolphinscheduler.plugin.task.api.AbstractTask;
import org.apache.dolphinscheduler.plugin.task.api.ShellCommandExecutor;
import org.apache.dolphinscheduler.plugin.task.api.TaskCallBack;
import org.apache.dolphinscheduler.plugin.task.api.TaskConstants;
import org.apache.dolphinscheduler.plugin.task.api.TaskException;
import org.apache.dolphinscheduler.plugin.task.api.TaskExecutionContext;
import org.apache.dolphinscheduler.plugin.task.api.model.Property;
import org.apache.dolphinscheduler.plugin.task.api.model.TaskResponse;
import org.apache.dolphinscheduler.plugin.task.api.parameters.AbstractParameters;
import org.apache.dolphinscheduler.plugin.task.api.parser.ParamUtils;
import org.apache.dolphinscheduler.plugin.task.api.parser.ParameterUtils;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

public class PytorchTask extends AbstractTask {

  private final ShellCommandExecutor shellCommandExecutor;
  protected PytorchParameters pytorchParameters;
  protected TaskExecutionContext taskExecutionContext;
  private PythonEnvManager pythonEnvManager;

  public PytorchTask(TaskExecutionContext taskExecutionContext) {
    super(taskExecutionContext);
    this.taskExecutionContext = taskExecutionContext;

    this.shellCommandExecutor = new ShellCommandExecutor(this::logHandle,
        taskExecutionContext,
        logger);
  }

  @Override
  public void init() {
    logger.info("python task params {}", taskExecutionContext.getTaskParams());

    pytorchParameters = JSONUtils.parseObject(taskExecutionContext.getTaskParams(), PytorchParameters.class);

    if (!pytorchParameters.checkParameters()) {
      throw new TaskException("python task params is not valid");
    }

    pythonEnvManager = new PythonEnvManager();
    pythonEnvManager.setPythonEnvTool(pytorchParameters.getPythonEnvTool());
    pythonEnvManager.setCondaPythonVersion(pytorchParameters.getCondaPythonVersion());
  }

  @Override
  public void handle(TaskCallBack taskCallBack) throws TaskException {
    try {
      String command = buildPythonExecuteCommand();
      TaskResponse taskResponse = shellCommandExecutor.run(command);
      setExitStatusCode(taskResponse.getExitStatusCode());
      setProcessId(taskResponse.getProcessId());
      setVarPool(shellCommandExecutor.getVarPool());
    } catch (InterruptedException e) {
      Thread.currentThread().interrupt();
      logger.error("The current Pytorch task has been interrupted", e);
      setExitStatusCode(TaskConstants.EXIT_CODE_FAILURE);
      throw new TaskException("The current Pytorch task has been interrupted", e);
    } catch (Exception e) {
      setExitStatusCode(TaskConstants.EXIT_CODE_FAILURE);
      throw new TaskException("Pytorch task execute failed", e);
    }
  }

  @Override
  public void cancel() throws TaskException {

  }


  public String buildPythonExecuteCommand() throws Exception {
    List<String> args = new ArrayList<>();

    String pythonPath = pytorchParameters.getPythonPath();

    if (GitProjectManager.isGitPath(pythonPath)) {
      GitProjectManager gpm = new GitProjectManager();
      gpm.setPath(pythonPath);
      gpm.setBaseDir(taskExecutionContext.getExecutePath());
      gpm.prepareProject();
      pytorchParameters.setPythonPath(gpm.getGitLocalPath());
    }

    args.add(String.format("export PYTHONPATH=%s", pytorchParameters.getPythonPath()));

    if (pytorchParameters.getIsCreateEnvironment()) {
      String buildEnvCommand = pythonEnvManager.getBuildEnvCommand(pytorchParameters.getRequirementPath());
      args.add(buildEnvCommand);
    }

    String scriptParams = pytorchParameters.getScriptParams();
    if (scriptParams != null && !scriptParams.isEmpty()) {
      args.add(String.format("%s %s %s", getPythonCommand(), pytorchParameters.getScriptPath(), pytorchParameters.getScriptParams()));
    } else {
      args.add(String.format("%s %s", getPythonCommand(), pytorchParameters.getScriptPath()));

    }

    Map<String, Property> paramsMap = taskExecutionContext.getPrepareParamsMap();
    return ParameterUtils.convertParameterPlaceholders(String.join("\n", args), ParamUtils.convert(paramsMap));
  }

  private String getPythonCommand() {
    String pythonCommand;
    if (pytorchParameters.getIsCreateEnvironment()) {
      pythonCommand = pythonEnvManager.getPythonCommand();
    } else {
      pythonCommand = pytorchParameters.getPythonCommand();
    }
    return pythonCommand;

  }


  @Override
  public AbstractParameters getParameters() {
    return pytorchParameters;
  }
}

